双金属导电分子2D金属有机框架 @ 2D MXene纳米板异构结构用于储存
Jianbo Xiong1, Qing Li1, Kaihui Li1
1State Key Laboratory of Nuclear Resources and Environment, School of Chemistry and Materials, East China University of Technology, Nanchang 330013, China.
Journal of colloid and interface science
|November 27, 2024
概括
研究人员开发了一种新的双金属导电二维金属有机框架 (MOF) 和使用MXene的异构结构,用于改进离子电池阴极,增强能量存储能力和长期稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术 纳米技术
背景情况:
- 由于其结构,二维金属有机框架 (2D MOF) 对存储具有前景.
- 挑战包括电导率低和长期循环稳定性差.
研究的目的:
- 为增强离子存储开发一个优化的双金属导电2D MOF.
- 用MXene创建异构结构以提高电化学性能.
主要方法:
- 一种双金属二维MOF (Co1.5Ni1.5(HHTP) 的合成2).
- 通过将2D MOF与2D Ti3C2 MXene纳米板结合起来,构建一个异构结构.
- 电化学测试 (容量,能量密度,循环稳定性,速度性能).
- 现场表征和密度函数理论 (DFT) 计算.
主要成果:
- 经过优化后的2D MOF电极在0.2A/g时实现了615.2 mAh/g的可逆容量,并在100个循环后达到826 Wh Kg-1的能量密度.
- 在2000个循环后,Co1.5Ni1.5(HHTP) 2@MXene异构结构保持了74.1%的初始容量,几乎100%的库伦比效率.
- DFT计算和电子状态研究确定了类氧和金属中心作为关键的氧化还原点,MXene增强了电子转移.
结论:
- 双金属导电的2D MOF显示了储存应用的巨大潜力.
- 异构结构设计有效地提高了速率性能和循环稳定性.
- 这项工作为设计高性能电池的先进电极材料提供了洞察力.
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